This will depend on the role you have applied for. Usually it will involve a short telephone interview from the head of the department or head of recruitment. If successful you will be invited to an interview. This will be with 2 people. The head of recruitment and the head of the department you have applied for.
When you arrive at the head office, Security will advise you were to park and which building to go to. You will need to go to the second floor and press the intercom for Cruise118. A member of staff will then take you to the necessary department.